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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c816624bb0c4fdccc76379474171cdfcb0ef2f67d1084dccd5bbe9d1ad4ccc0b' 
  AND token = 'o7yyk5NqEkT5I9zDBiJkw2UMwaN5JoKRlS6yB6485QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}